How Proximity Alert Systems Improve Forklift and Pedestrian Safety

Forklifts move materials efficiently, but their routes often bring them close to pedestrians. A warehouse employee may step out from behind racking just as a forklift enters the aisle. At a loading area, a driver may reverse while another worker is concentrating on a nearby task. Even when both people follow established procedures, a load, doorway or structural column may briefly obstruct their view.

These encounters can develop within seconds. The risk is not limited to large distribution centres either. Manufacturing plants, workshops, ports and loading areas may all have points where people and mobile equipment share limited space.

Separating pedestrians from vehicles should therefore remain the priority wherever reasonably practicable. The International Labour Organization recommends measures such as separate pedestrian and vehicle routes, suitable crossing points and one-way traffic systems. However, some sites cannot completely remove every interaction because of their layout or operating requirements.

That is where a proximity alert system may provide an additional warning layer. Instead of relying entirely on sight, hearing or a driver remembering to sound the horn, the system detects equipped pedestrians or vehicles within a configured zone and warns the people involved. The warning creates an opportunity to stop, slow down or move away before the distance closes further.

Key Takeaways

• Proximity alerts can improve awareness when pedestrians and forklifts approach each other, particularly around blind corners, racking and other visibility obstructions.
• The featured system uses vehicle-mounted magnetic-field generators and Personal Alarm Devices worn by pedestrians.
• The detection area must reflect vehicle speed, stopping distance, site layout and normal work activities.
• Alert fatigue, incomplete use of wearable devices and poor maintenance can weaken the system’s effectiveness.
• Proximity warnings support—not replace—traffic separation, training, supervision, vehicle maintenance and safe operating procedures.

Why Forklift-Pedestrian Risks Can Be Difficult to Control

A forklift operator’s view changes according to the vehicle, load and direction of travel. According to the United Kingdom’s Health and Safety Executive (HSE), lift trucks carrying bulky loads can have restricted forward visibility. The mast, bodywork and surrounding racking may create further blind spots, while reversing introduces additional visibility challenges.

Pedestrians face a different set of limitations. They may hear an alarm or horn without being able to determine where it is coming from. Background noise from machinery, ventilation systems and other vehicles can also make conventional audible warnings less noticeable. Visitors and contractors may be unfamiliar with the site’s traffic routes, while experienced employees may become less cautious around movements they encounter every day.

Changes within the workplace can add to these risks. Temporary stock, parked equipment and production materials may restrict an otherwise clear view. Busy periods can also alter normal movement patterns as more vehicles, temporary workers or contractors enter the same area.

These conditions do not necessarily mean that employees or drivers are behaving carelessly. Instead, they show why safety cannot depend on a single person seeing or hearing every developing hazard. A risk assessment must consider how the site, equipment and work practices interact.

In Malaysia, the Occupational Safety and Health Act 1994, incorporating the 2022 amendments, requires employers to ensure, so far as is practicable, the safety, health and welfare of employees. This includes providing and maintaining safe plant and systems of work, as well as appropriate information, instruction, training and supervision.

A proximity alert system may form part of these arrangements, but the decision to install one should follow the site’s hazard identification and risk assessment. This keeps the focus on the actual traffic problem rather than on adding technology without a clearly defined purpose.

How a Forklift Proximity Alert System Works

Proximity alert systems do not all use the same sensing method. Depending on the design, they may use radio-frequency identification, ultra-wideband, cameras, ultrasonic sensors or other technologies. Each method has different requirements and limitations, so the operating principle matters when evaluating a system.

The Humi Pak Proximity Alert System uses a low-frequency magnetic field. Its core configuration includes a generator mounted on the forklift or other mobile equipment and a Personal Alarm Device (PAD) worn by each pedestrian who needs to be detected.

The generator establishes a configurable field around the vehicle. When a pedestrian enters this field, the PAD detects it and issues audible and visual warnings. At the same time, the vehicle-mounted warning module alerts the forklift operator that an equipped pedestrian has entered the detection area. Although the pedestrian wears the PAD, the system therefore warns both parties and gives them an opportunity to respond.

The system can be configured with two detection zones:

• A warning zone gives an earlier alert as the pedestrian approaches the vehicle.
• A danger zone produces a more urgent warning when the distance becomes smaller.

This distinction helps communicate that the level of risk is increasing. However, the zones are warning thresholds rather than physical barriers. They do not determine whether the vehicle can stop within the remaining distance, and the standard warning function should not be described as automatic braking.

That difference is important. A proximity warning system alerts people and depends on them taking the required action. A system that automatically reduces speed or stops a vehicle requires additional controls and confirmed technical integration. These functions should not be assumed unless they are included in the selected configuration and verified as compatible with the vehicle.

Where Proximity Alerts Can Add Practical Value

Understanding how the system operates makes it easier to identify where it may help. Suitable locations are generally those where vehicle-pedestrian interaction remains possible after practical physical and procedural controls have been applied.

Blind Corners and Obstructed Aisles

Racking, stored materials, doorways and structural columns can prevent a pedestrian and driver from seeing each other until they are close. A magnetic-field system does not rely on a clear visual line between its vehicle generator and the PAD, which can make it useful around certain obstructions.

This does not mean the system should replace barriers, mirrors, signs or changes to the traffic route. Instead, it can provide an additional warning where residual risk remains despite those measures.

Loading, Dispatch and Staging Areas

Loading areas often have changing traffic conditions. Vehicles arrive and leave, loads are placed temporarily, and employees move between docks, staging points and warehouse aisles. A route that is clear during one shift may become congested during another.

Because these conditions change, a fixed warning sign may not be enough on its own. A proximity alert can respond to an actual encounter between an equipped pedestrian and vehicle, but the alert zones must be set carefully. An unnecessarily large zone in a busy staging area may trigger warnings so frequently that people begin treating them as routine background noise.

Noisy Operating Environments

In noisy plants or warehouses, a conventional reversing alarm may blend with other sounds. A PAD provides an alert close to the pedestrian, while the vehicle-mounted warning module informs the operator.

Nevertheless, alert audibility must be assessed under real operating conditions. Hearing protection, machinery noise and the position of the warning module can all affect whether an alarm is noticed. Visual warnings may therefore need to complement sound rather than being treated as optional.

Areas Shared by Several Vehicles

When forklifts or other mobile equipment operate close to one another, vehicle-to-vehicle encounters may also require attention. The system can include a collision avoidance module that detects the magnetic field generated by another equipped vehicle and warns the operators.

Despite its name, the collision avoidance module is a warning component. Operators must still follow the agreed response procedure. If a site requires automatic speed control or braking, that need should be assessed separately and compatibility confirmed before selection.

These examples show where alerts can be useful, but location alone does not determine whether a deployment will work. Its effectiveness also depends on how the detection zones and operating procedures are designed.

Configuring Detection Zones Around the Actual Risk

A larger detection zone is not automatically a safer one. If the zone extends into neighbouring pedestrian-safe areas, offices or workstations, alarms may activate even though a wall or barrier prevents an encounter. Repeated non-actionable alerts can cause frustration and reduce confidence in the system.

On the other hand, a detection zone that is too small may not leave enough time for the operator and pedestrian to recognise the warning and respond. Configuration should therefore consider:

• The vehicle’s normal and maximum permitted speed
• Braking and stopping distance under expected load conditions
• Floor condition, gradients and wet or uneven surfaces
• The direction of travel and frequency of reversing
• Visibility around doorways, racking and intersections
• Pedestrian routes and crossing points
• Normal traffic density during different shifts
• The time needed for the operator and pedestrian to react
• Nearby rooms or work areas where unnecessary alarms could occur

The appropriate distance may vary across a site. A forklift travelling along an open route may require a different warning arrangement from one moving slowly within a loading bay. It may therefore be necessary to test several settings rather than apply one distance to every vehicle and location.

Depending on the site’s operating needs, the system can include additional proximity alert components, such as area monitors for intersections, PAD testing and charging equipment, and devices for establishing silent areas.

Any silencing function must be applied cautiously so that it suppresses unnecessary warnings without masking a genuine vehicle-pedestrian risk.

Once the zones are configured, the next question is how people should respond. Without a consistent response procedure, even an accurately triggered alert may not prevent a close encounter.

Turning an Alert Into a Reliable Safety Response

An alarm only communicates that a detection threshold has been crossed. It does not explain who should move, where the pedestrian should go or whether the driver should stop completely. Those actions must be established through site procedures and training.

For example, a facility may require the driver to slow down and prepare to stop when the warning-zone alert activates. Entry into the danger zone may require an immediate stop until the driver has located the pedestrian and confirmed that the route is clear. Pedestrians, meanwhile, need to know whether they should remain still, return to a protected walkway or move to another designated safe position.

The procedure should be simple enough to apply consistently during a busy shift. It should also cover less routine situations, such as:

• A visitor entering an operating area without a PAD
• A pedestrian discovering that the PAD has a low battery
• An alarm continuing after the apparent hazard has passed
• A driver receiving warnings from several directions
• Damage to a vehicle-mounted generator or warning module
• Temporary traffic changes during maintenance or loading

Training should explain the system’s limitations as clearly as its benefits. The system relies on pedestrians wearing functioning PADs. When a PAD detects the magnetic field around an equipped forklift, it warns the pedestrian while the vehicle-mounted warning module simultaneously alerts the operator.

However, the system cannot be assumed to detect someone who is not wearing a PAD. This may include visitors, contractors or employees who have not been issued a device. It should not be expected to detect pallets, fixed obstacles or other hazards unless separate equipment has been installed for that purpose.

Consistent PAD issuance, testing and use are therefore essential to the safety process. These requirements lead to another important consideration: how the devices and vehicle-mounted components will be checked and maintained during everyday operations.

Managing PADs, Testing and Maintenance

A Personal Alarm Device only contributes to detection if the correct person is wearing it, the battery is charged and the device is functioning. PAD management should therefore be incorporated into shift preparation rather than left to individual memory.

A practical process may include issuing assigned or checked devices at the start of each shift, confirming their operation at a test station and returning them for charging afterwards. Arrangements are also needed for contractors, maintenance personnel and visitors who may enter vehicle operating areas.

Vehicle-mounted components also require regular inspection. Mounting positions, cabling and warning indicators should be checked after servicing, impacts or changes to the vehicle. A system that functioned correctly during installation may not continue performing as intended if a component is damaged, disconnected or repositioned.

Records can help identify repeated issues, but their purpose is not merely administrative. Frequent low-battery warnings, damaged clips or missing devices may indicate that the issuing and charging process is impractical. Similarly, repeated alarms in a physically separated area may show that a detection zone requires adjustment.

Employee feedback is valuable during this review. Operators and pedestrians can often identify nuisance alerts, locations with insufficient warning time or procedures that are difficult to follow. Their observations should be considered alongside inspection findings, maintenance records and near-miss reports.

This review process helps keep the technology aligned with the workplace as routes, equipment and staffing change.

Using Proximity Alerts Within a Layered Safety Approach

Proximity detection addresses one specific gap: a lack of timely awareness when an equipped person or vehicle enters a configured area. It does not control every cause of a collision.

The first priority should remain eliminating unnecessary interaction. The ILO’s workplace transport guidance recommends planning workplaces so that pedestrians are protected from vehicles, including through separate routes and one-way traffic systems where practicable.

The HSE also recommends reducing reversing wherever possible and improving site layouts to increase visibility for drivers and pedestrians. Where reversing cannot be avoided, measures such as well-maintained mirrors, cameras, detectors and alarms may help manage the remaining risk.

Where complete separation is not practicable, complementary controls may include:

• Physical barriers and protected pedestrian walkways
• Marked and appropriately positioned crossing points
• One-way vehicle routes and speed limits
• Mirrors and clear sightlines at intersections
• Suitable lighting and signs
• Trained and authorised operators
• Vehicle inspections and preventive maintenance
• Rules for visitors and contractors
• Reporting and investigation of near misses
• Proximity warnings selected for the remaining risk

These measures should work together as a coordinated safety process. That does not mean they are technically integrated or exchange information through a common platform. Unless such integration is confirmed, each control should be managed and maintained according to its own requirements.

This distinction also prevents organisations from treating the installation of a warning system as the end of the risk assessment. Traffic patterns should be reviewed after layout changes, new equipment, increased production or any incident indicating that the existing controls may no longer be sufficient.

Selecting a System That Fits the Workplace

Before choosing a proximity alert system, begin with the encounter that needs to be controlled. Is the main concern a pedestrian emerging from behind racking, two forklifts approaching a junction or employees moving through a loading area? A clearly defined scenario makes it easier to evaluate the required detection method and components.

The assessment should then consider the following questions.

Who or What Must Be Detected?

Determine whether the system needs to identify equipped pedestrians, vehicles, fixed structures or a combination of these. This prevents the system from being selected based on functions that do not address the site’s main risk.

Can Wearable-Device Use Be Controlled?

Consider how PADs will be issued, tested, charged and provided to temporary personnel. If consistent use cannot be maintained, the site may need additional controls for people who are not carrying a device.

What Warnings Will People Notice?

Evaluate audible and visual alerts under actual noise, lighting and personal protective equipment conditions. A warning that appears clear during a quiet demonstration may be less noticeable during normal production.

How Should the Zones Be Configured?

Base the detection distances on operating speed, stopping distance, layout and response time rather than simply selecting the largest available setting. The aim is to provide sufficient warning without creating frequent non-actionable alarms.

What Happens After an Alert?

Define the required actions for operators and pedestrians before commissioning the system. The procedure should explain what each warning level means and when normal movement may resume.

How Will Performance Be Reviewed?

Establish inspection, testing, maintenance and feedback arrangements. This should include a process for investigating repeated, unexpected or missing alarms.

A site survey and controlled trial can help answer these questions. Testing should reproduce realistic movements and obstructions without exposing employees to danger. It should also cover different shifts if traffic volume, lighting or noise varies during the day.

Improving Awareness Without Creating False Assurance

Forklift-pedestrian risks often develop where visibility, movement and attention change at the same time. Proximity alert systems can strengthen awareness in these situations by warning equipped pedestrians and operators when a configured detection threshold is crossed.

Their value, however, depends on more than the equipment. Detection zones must suit the site, PADs must be worn and maintained, and everyone involved must understand how to respond. The system should sit alongside physical separation, suitable traffic routes, training, supervision and vehicle maintenance—not replace them.

Humi Pak supplies low-frequency magnetic-field proximity alert systems for mobile equipment. Organisations evaluating the system can discuss their vehicle types, traffic layout and pedestrian interaction points with Humi Pak to determine an appropriate configuration.